表单操作在不单击提交的情况下运行

Question

I have a page where you view what is in your cart (a work in progress obviously) and there is a button to clear your cart, and it works, but moving to another page in the site, whether by clicking a link or typing in the address bar, runs the form action. It also does it on the product page to add to the cart. How do I stop this happening so the action only runs when the button is pressed?

<div id="">
     <?php echo "You have " . $_SESSION['cartItems'];
       if($_SESSION['cartItems'] == 1){
        echo " item";
       } else {
        echo " items";
       }
       echo " in your cart amounting to $" . $_SESSION['cartPrice'];?>
       <form action="<?php session_destroy();?>"><input type="submit" value="Clear Cart"></form>
</div>

Answer 1

After some time I undestand what you want to do. You can't destroy the session in action attribiute but you can put in action attribute the page where session will be destroyed

destroy.php

<?php
session_start();
session_destroy();
echo 'destroyed';

?>

Your main file

<div>
 <?php 
   echo "You have " . $_SESSION['cartItems'].($_SESSION['cartItems'] > 1 ? 'items' : 'item');
   echo " in your cart amounting to $" . $_SESSION['cartPrice'];?>
   <form action="destroy.php"><input type="submit" value="Clear Cart"></form>
</div>

You can also put in action ="" and use some hidden param and check if it should be destroyed for example:

One file solution:

 <div>
 <?php 
   session_start();
   if(isset($_POST['destroy']) && $_POST['destroy'] == 1) session_destroy(); //destroying session

   echo "You have " . $_SESSION['cartItems'].($_SESSION['cartItems'] > 1 ? 'items' : 'item');
   echo " in your cart amounting to $" . $_SESSION['cartPrice'];?>
   <form method="POST" action="">
      <input type="submit" value="Clear Cart"><input type="hidden" value="1" name="destroy">
   </form>
</div>